Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10 5X2 7 21B6 found under O Ring by Victoria Technologies. The National Stock Number assigned to this part is 5331143640280, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10 5X2 7 21B6.